cmake: armlink: update CMake library to arch__arm__core__cortex_m

Fixes: #62589
Follow-up: #60031

The PR #60031 moved CMake code to new folder location causing generated
library names to change.
This change impacted the use of those libraries in the Zephyr armlink
CMake code, causing CMake failures at configure time.

This PR fixes this failure by updating the armlink CMake code to use
the new library names.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>